# Project Structure with autoload — Fastify: Building High-Performance Node.js APIs

Source: https://www.geekswithgeeks.com/en/fastify/ff-autoload-structure

> Organize a Fastify app into plugins and routes folders and load them automatically with @fastify/autoload.

## Folders as plugins

Put shared plugins in `plugins/` and route modules in `routes/`, then let autoload register them.

```javascript
// src/app.js
import AutoLoad from '@fastify/autoload';
import { join } from 'node:path';

export default async function app(fastify, opts) {
  fastify.register(AutoLoad, { dir: join(import.meta.dirname, 'plugins') });
  fastify.register(AutoLoad, { dir: join(import.meta.dirname, 'routes'), options: { prefix: '/api' } });
}
```

Export `build()` from `app.js` and call `listen` only in `server.js`. Tests can then import the app and use `inject` without opening a port.